The aunt started back, then made a step towards Mabel.

"You naughty, naughty girl!" she cried angrily; "how could you give me such a fright? I've a good mind to keep you in bed for a week for this, miss. Oh, Mabel, thank Heaven you're safe!" And with that the aunt's arms went round Mabel and Mabel's round the aunt in such a hug as they had never met in before.

"But you didn't seem to care a bit this morning," said Mabel, when she had realized that her aunt really had been anxious, really was glad to have her safe home again.

"How do you know?"

"I was there listening. Don't be angry, auntie."

"I feel as if I could never be angry with you again, now I've got you safe," said the aunt surprisingly.

"But how was it?" Mabel asked.

"My dear," said the aunt impressively, "I've been in a sort of trance. I think I must be going to be ill. I've always been fond of you, but I didn't want to spoil you. But yesterday, about half-past three, I was talking about you to Mr. Lewson, at the fair, and quite suddenly I felt as if you didn't matter at all. And I felt the same when I got your letter and when those children came. And today in the middle of tea I suddenly woke up and realized that you were gone. It was awful. I think I must be going to be ill. Oh, Mabel, why did you do it?"

"It was a joke," said Mabel feebly. And then the two went in and the door was shut.

"That's most uncommon odd," said Gerald, outside; "looks like more magic to me. I don't feel as if we d got to the bottom of this yet, by any manner of means. There's more about this castle than meets the eye."

There certainly was. For this castle happened to be but it would not be fair to Gerald to tell you more about it than he knew on that night when he went alone and invisible through the shadowy great grounds of it to look for the open window of the panelled room.

He knew that night no more than I have told you; but as he went along the dewy lawns and through the groups of shrubs and trees, where pools lay like giant looking-gla.s.ses reflecting the quiet stars, and the white limbs of statues gleamed against a background of shadow, he began to feel well, not excited, not surprised, not anxious, but different.

The incident of the invisible Princess had surprised, the incident of the conjuring had excited, and the sudden decision to be a detective had brought its own anxieties; but all these happenings, though wonderful and unusual, had seemed to be, after all, inside the circle of possible things wonderful as the chemical experiments are where two liquids poured together make fire, surprising as legerdemain, thrilling as a juggler's display, but nothing more. Only now a new feeling came to him as he walked through those gardens; by day those gardens were like dreams, at night they were like visions. He could not see his feet as he walked, but he saw the movement of the dewy gra.s.s-blades that his feet displaced. And he had that extraordinary feeling so difficult to describe, and yet so real and so unforgettable the feeling that he was in another world, that had covered up and hidden the old world as a carpet covers a floor. The floor was there all right, underneath, but what he walked on was the carpet that covered it and that carpet was drenched in magic, as the turf was drenched in dew.

The feeling was very wonderful; perhaps you will feel it some day.

There are still some places in the world where it can be felt, but they grow fewer every year.

The enchantment of the garden held him.

"I'll not go in yet," he told himself; "it's too early. And perhaps I shall never be here at night again. I suppose it is the night that makes everything look so different."

Something white moved under a weeping willow; white hands parted the long, rustling leaves. A white figure came out, a creature with horns and goat's legs and the head and arms of a boy.

And Gerald was not afraid. That was the most wonderful thing of all, though he would never have owned it. The white thing stretched its limbs, rolled on the gra.s.s, righted itself and frisked away across the lawn. Still something white gleamed under the willow; three steps nearer and Gerald saw that it was the pedestal of a statue empty.

"They come alive," he said; and another white shape came out of the Temple of Flora and disappeared in the laurels. "The statues come alive."

There was a crunching of the little stones in the gravel of the drive.

Something enormously long and darkly grey came crawling towards him, slowly, heavily. The moon came out just in time to show its shape. It was one of those great lizards that you see at the Crystal Palace, made in stone, of the same awful size which they were millions of years ago when they were masters of the world, before Man was.

"It can't see me," said Gerald. "I am not afraid. It's come to life, too."

As it writhed past him he reached out a hand and touched the side of its gigantic tail. It was of stone. It had not "come alive" as he had fancied, but was alive in its stone. It turned, however, at the touch; but Gerald also had turned, and was running with all his speed towards the house. Because at that stony touch Fear had come into the garden and almost caught him. It was Fear that he ran from, and not the moving stone beast.

He stood panting under the fifth window; when he had climbed to the window-ledge by the twisted ivy that clung to the wall, he looked back over the grey slope there was a splashing at the fish-pool that had mirrored the stars the shape of the great stone beast was wallowing in the shallows among the lily-pads.

Once inside the room, Gerald turned for another look. The fish-pond lay still and dark, reflecting the moon. Through a gap in the drooping willow the moonlight fell on a statue that stood calm and motionless on its pedestal. Everything was in its place now in the garden. Nothing moved or stirred.

"How extraordinarily rum!" said Gerald. "I shouldn't have thought you could go to sleep walking through a garden and dream like that."

He shut the window, lit a match, and closed the shutters. Another match showed him the door. He turned the key, went out, locked the door again, hung the key on its usual nail, and crept to the end of the pa.s.sage. Here he waited, safe in his invisibility, till the dazzle of the matches should have gone from his eyes, and he be once more able to find his way by the moonlight that fell in bright patches on the floor through the barred, unshuttered windows of the hall.

"Wonder where the kitchen is," said Gerald. He had quite forgotten that he was a detective. He was only anxious to get home and tell the others about that extraordinarily odd dream that he had had in the gardens. "I suppose it doesn't matter what doors I open. I'm invisible all right still, I suppose? Yes; can't see my hand before my face." He held up a hand for the purpose. "Here goes!"

He opened many doors, wandered into long rooms with furniture dressed in brown holland covers that looked white in that strange light, rooms with chandeliers hanging in big bags from the high ceilings, rooms whose walls were alive with pictures, rooms whose walls were deadened with rows on rows of old books, state bedrooms in whose great plumed four-posters Queen Elizabeth had no doubt slept. (That Queen, by the way, must have been very little at home, for she seems to have slept in every old house in England.) But he could not find the kitchen. At last a door opened on stone steps that went up there was a narrow stone pa.s.sage steps that went down a door with a light under it. It was, somehow, difficult to put out one's hand to that door and open it.

"Nonsense!" Gerald told himself, "don't be an a.s.s! Are you invisible, or aren't you?"

Then he opened the door, and someone inside said something in a sudden rough growl.

Gerald stood back, flattened against the wall, as a man sprang to the doorway and flashed a lantern into the pa.s.sage.

"All right," said the man, with almost a sob of relief. "It was only the door swung open, it's that heavy that's all."

"Blow the door!" said another growling voice; "blessed if I didn't think it was a fair cop that time."

They closed the door again. Gerald did not mind. In fact, he rather preferred that it should be so. He didn't like the look of those men.

There was an air of threat about them. In their presence even invisibility seemed too thin a disguise. And Gerald had seen as much as he wanted to see. He had seen that he had been right about the gang. By wonderful luck beginner's luck, a card-player would have told him he had discovered a burglary on the very first night of his detective career. The men were taking silver out of two great chests, wrapping it in rags, and packing it in baize sacks.

The door of the room was of iron six inches thick. It was, in fact, the strong-room, and these men had picked the lock. The tools they had done it with lay on the floor, on a neat cloth roll, such as wood-carvers keep their chisels in.

"Hurry up!" Gerald heard. "You needn't take all night over it."

The silver rattled slightly. "You're a rattling of them trays like bloomin' castanets," said the gruffest voice. Gerald turned and went away, very carefully and very quickly. And it is a most curious thing that, though he couldn't find the way to the servants wing when he had nothing else to think of, yet now, with his mind full, so to speak, of silver forks and silver cups, and the question of who might be coming after him down those twisting pa.s.sages, he went straight as an arrow to the door that led from the hall to the place he wanted to get to.

As he went the happenings took words in his mind.

"The fortunate detective," he told himself, "having succeeded beyond his wildest dreams, himself left the spot in search of a.s.sistance."

But what a.s.sistance? There were, no doubt, men in the house, also the aunt; but he could not warn them.

He was too hopelessly invisible to carry any weight with strangers.

The a.s.sistance of Mabel would not be of much value. The police?

Before they could be got and the getting of them presented difficulties the burglars would have cleared away with their sacks of silver.

Gerald stopped and thought hard; he held his head with both hands to do it. You know the way the same as you sometimes do for simple equations or the dates of the battles of the Civil War.

Then with pencil, note-book, a window-ledge, and all the cleverness he could find at the moment, he wrote: "You know the room where the silver is. Burglars are burgling it, the thick door is picked. Send a man for police. I will follow the burglars if they get away ere police arrive on the spot."

He hesitated a moment, and ended "From a Friend this is not a sell."

This letter, tied tightly round a stone by means of a shoelace, thundered through the window of the room where Mabel and her aunt, in the ardour of reunion, were enjoying a supper of unusual charm stewed plums, cream, sponge-cakes, custard in cups, and cold bread-and-b.u.t.ter pudding.

Gerald, in hungry invisibility, looked wistfully at the supper before he threw the stone. He waited till the shrieks had died away, saw the stone picked up, the warning letter read.

"Nonsense!" said the aunt, growing calmer. "How wicked! Of course it's a hoax."

"Oh! do send for the police, like he says," wailed Mabel.

"Like who says?" snapped the aunt.